add placeholder for optimizer trace point

deps/oblib/src/lib/utility/ob_tracepoint.h

@@ -638,6 +638,8 @@ class EventTable
       EN_ENABLE_AUTO_DOP_FORCE_PARALLEL_PLAN = 552,
       EN_GENERATE_PLAN_WITH_RECONSTRUCT_SQL = 553,
       EN_GENERATE_PLAN_WITH_NLJ = 554,
+      //EN_CHECK_OPERATOR_OUTPUT_ROWS = 555,
+      //EN_GENERATE_RANDOM_PLAN = 556,
 
       // 600-700 For PX use
       EN_PX_SQC_EXECUTE_FAILED = 600,